Inner tube for pneumatic tires.



M. GULMORE.

INNER TUBE FOR PNEUMATIC TIRES.

APPLICATION FILED mmze, 190s.

Patented Apr. 20, 1909.

R 0 I N E V N Wilt/46 04770142 AHORNEY duce; also one which wi UNITED SIATES PATENT I MABGHUULMORRDF e -ea, We

, Toicll whomit may concern: v v

Be it known that I, llfancn Cumronn, citi zen of the Unitedstates, residing at Houston, in the county of Harris andfitate of Texas, have invented certain new and useful Irri- Irovementsin Inner Tubes for Pneumatic l-ires, of which the following is a specification.

My invention relates to new and useful improvements in inner tubes for pneumatic. tires.

The obj act of the invention is to provide a tube having layers of fabric vulcanized in a portion thereof and extendinglloosely beyond a ortion of the tube, whic portion is rein orced so as to expand against the fabric; and in providing sucha-tube to produce one which will not burst or explode when the casing is accidentally displaced from the rim.

Another feature is to provide a tube of such strength and resiliency as to readily fit in an old casing whichhas been stretched without detrimental effects! Finally the object of the invention is to provide a device of the character described that will be strong, durable and efficient, and simple and comparativel inexpensive to proll not be liable to get out-of Working order.

With the above and other objects in view the inventionhas relation to certain novel features-0f construction and operation, an example of which is described in the specificationand illustrated in the accompanying drawings, wherein:

Figure 1 is a cross section of my improved tube uninfiated, and Fi 2 is a cross section of a tire showing my tn in position therein and inflated, its uninflated position being indicated in dotted lines.

In the drawings the numeral 1 designates the tube which is formed with an outer coating or layer of rubber 2 extending partially therearound. This layer is vulcanized to a plurality of layers of fabric 3, to the inner side of which a circular layer of rubber 4 is vulcanized throughout a portion of its circumference. The fabric layers extend some dis nce beyond the rubber layers 2 and 4 forming a pocket 5. The inner layer 4 swings across this pocket some distance inward as indicated at 6. The portion 6 of the layer 4 is considerably thicker than the rest of the layer and of such resiliency as to be on pahlo of expansion into the pocket,

' Specifi ation of Letters Patent; '-.Patented Application filed June 26, 1908. Serial No. 449,437.

, INNER TUBE FOR PNn na'rro rrnris.

Aprneo, 1909. I

the layer 2 contacting with the tread and} side portions of the casing. It will benotedf' that the pocket 5-fitsbetween the'shoesfi of the casing and in close proximity orpn the rim (not shown); :lnward from'thelayer 2,

In 2 tlie tube is'sho'wn mac-l a sing the fabric layers contact withth'e inner walls of the casing, that is, when the tube is iniiated. It will be noted that when the tube is inflated substantially all the expansion takes place at the portion 6 which is forced into the pocket :5 and into contact with thefabric layers, which latter protect and sup port the said portion. It will be further noted that the fabric layers extend continuouslyaround the tube rend it extremely strong and durable and capabl severe shocks andv impacts. As a matter 0 fact the pocket 5 forms a guard to limit the expansion of the portion-6 and at the same time so stoutly supports the inner layer 4 as to prevent bursting of the same. In this way should the outer casing be dis laced from the rim by accident, the tube won (1 not explode or burst on account of its protecting layers of fabric and resilient nature. It is ed to such an extent as to closely contact with the inner walls of the fabric pocket, the

latter would still protect the said ortion and give it additional space intowhic to expand as will be apparent. i-

What I claim, is:

i 1. A tube for pneumatic tires comprisingla I layer of rubber, and a fabric portion partia secured to thelayer and having a portion free from the layer to form a continuous pocket into which the layer of rubber is adapted to expand. 4

2. A tube for'pneumatic tires comprisin a layer of rubber, and a fabric portion partia y x secured to the layer, said fabric portion havin a portion extending beyond. the layer of ru her and across which the said layer extends.

3. A tube for pneumatic tires coniprisin a layer of rubber, and a fabric portion partially secured to the layer and having a portion 'extending beyond the layer of rubber and across which the said layer extends, that portion of the layer: of rubber extending across e of resisting.

evident that if the portion 6 was not expand-v the extended portion of the fabric being concontinuous inner layer of rubber, and a fabric portion partially secured to the layer and aying a portion extending away from the layer'andforrning a pocket into which the 5 layer is adapted to expand.

10 ric having a portion unattached and extending away from the layer of rubber.

6. A tube for pneumatic tires comprising a continuous layer of fabric, and a continuous layer of rubber considerably smaller in diam- 15 eter than the layer of fabric, said layer of fabtic having a portion vulcanized to the layer 1 of rubber and a Portion unattached to and extending away ro'in the layer of rubber.

7. A tube for pneumatic tires com rising an inner layer of rubber,- a lurality 01 layers oi fabric surrounding sai inner layer and having a portion forming a pocket into which the inner layer is adapted to expand, and an outer layer of rubber partially covering the fabric layer.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MARCH OULMOR-E.

Witnesses: i I

WM. A. (JATHEY, EVA CATHEY. 

